EP 0672556 B1 19981111 - Clutch engagement modulation to control acceleration
Title (en)
Clutch engagement modulation to control acceleration
Title (de)
Regelung des Kupplungseingriffes zur Steuerung der Beschleunigung
Title (fr)
Modulation de l'engagement d'embrayage pour contrÔler l'accélération
Publication
Application
Priority
US 20991494 A 19940314
Abstract (en)
[origin: EP0672556A1] In a tractor transmission system having electro-hydraulically actuated powershift clutches (C1-C4) and a forward/reverse coupler (25) mechanically coupled to a forward/reverse lever (100), a dump button (118) is provided on the lever (100) for releasing powershift clutch pressure. The forward/reverse coupler (25) is uncoupled from the transmission input and output shafts (10, 11) when the button (118) is depressed. An operator may shift between forward and reverse gears by depressing the button (118) and shifting the lever (100). Upon release of the dump button (118), a microprocessor (80) performs a control algorithm during which it senses engine speed and ground speed, computes acceleration/deceleration, and controls the clutch pressure of one of the powershift clutches (C1-C4) to provide smooth acceleration in the direction selected by the shift lever (100). The arrangement is particularly suited for shuttle shift (forward/reverse) operations but may be used to provide smooth acceleration from a stopped position. Smooth acceleration is obtained regardless of the tractor weight and load and operation of a clutch pedal (78) is not required. The control algorithm is equally suitable for controlling full powershift transmissions or synchronized shuttle transmissions having no powershift clutches. <IMAGE>
IPC 1-7
IPC 8 full level
F16H 59/48 (2006.01); F16H 61/06 (2006.01); F16H 59/08 (2006.01); F16H 59/44 (2006.01); F16H 61/00 (2006.01); F16H 61/12 (2010.01); F16H 61/684 (2006.01); F16H 61/70 (2006.01)
CPC (source: EP US)
B60W 30/18027 (2013.01 - EP); F16H 59/48 (2013.01 - EP US); F16H 61/061 (2013.01 - EP US); B60W 2520/10 (2013.01 - EP US); B60W 2520/105 (2013.01 - EP US); B60W 2720/106 (2013.01 - EP US); F16H 59/44 (2013.01 - EP US); F16H 61/684 (2013.01 - EP US); F16H 61/70 (2013.01 - EP US); F16H 2059/088 (2013.01 - EP US); F16H 2061/0096 (2013.01 - EP US); F16H 2061/1208 (2013.01 - EP US); F16H 2312/02 (2013.01 - EP US); Y10T 74/1926 (2015.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0672556 A1 19950920; EP 0672556 B1 19981111; DE 69505865 D1 19981217; DE 69505865 T2 19990408; US 5450768 A 19950919
DOCDB simple family (application)
EP 95200578 A 19950309; DE 69505865 T 19950309; US 20991494 A 19940314